Optoelectronics has become a go-to solution for distance sensing, where a combination of a light-emitting diode (LED) and a transistor can work wonders. The Vishay CNY70 takes center stage by seamlessly integrating both semiconductors into a single housing, offering a reliable and efficient solution for distance measurements.

Vishay CNY70

Vishay CNY70 sensor

Simplified Circuitry for Precise Measurements

In a straightforward CNY70 circuit, the emitter diode requires a drive current, typically up to 50mA, although a stable 20mA current is commonly used. To ensure precision, maintaining a constant current source is preferable to a simple ohmic resistor. Once the emitter sends photons to the target and receives their reflection, the collector current can be measured. This measurement is influenced by the target's permittivity, providing valuable information about the distance to the reflective surface.

Adaptive to Daylight Conditions

The Vishay CNY70 employs 950nm light and incorporates a daylight filter, enabling its functionality even in well-lit areas. This strategic design decision helps save on costs, as there is no need to shield the sensor from ambient light. However, to ensure accurate measurements, avoid exposing the sensor to light in a similar spectral range, which could lead to incorrect readings.

Competitive Pricing for Versatile Performance

A price analysis on OEMSecrets reveals that Vishay's CNY70 sensors are readily available from specialized and general-purpose distributors. For individual units, the cost typically hovers around one Euro, but as quantities increase into the hundreds, prices drop to a range of 50 to 70 euro cents (Price correct as per publication date). It's important to note that the CNY70 is available only in a through-hole form factor, which may slightly increase pick and place costs during PCB assembly. Additionally, keeping the sensor's lens free from dust is crucial to ensure optimal performance.

CNY70 sensor pricing

Conclusion

When in need of presence measurement against reflective or semi-reflective surfaces, the Vishay CNY70 emerges as a reliable, efficient, and budget-friendly method. However, it's essential to incorporate analog circuitry to maximize its potential. If no analog expertise is available on-site, consider exploring time-of-flight sensors as an alternative with potentially lower total cost of ownership. Embrace the power of Vishay CNY70 and unleash its full potential in distance sensing applications, propelling your projects forward with accuracy and cost-effectiveness.